*************************************************************************
Copyright (C) Olivetti 1989
All Rights reserved
Use and copy of this software and preparation of derivative works based
upon this software are permitted to any person, provided this same
copyright notice and the following Olivetti warranty disclaimer are
included in any copy of the software or any modification thereof or
derivative work therefrom made by any person.
This software is made available AS IS and Olivetti disclaims all
warranties with respect to this software, whether expressed or implied
under any law, including all implied warranties of merchantibility and
fitness for any purpose. In no event shall Olivetti be liable for any
damages whatsoever resulting from loss of use, data or profits or
otherwise arising out of or in connection with the use or performance
of this software.
*************************************************************************
Copyright (C) 1993, Digital Equipment Corporation
All rights reserved.
See the file COPYRIGHT for a full description.
MODULE M3ASTDisplay EXPORTS M3ASTDisplay, AST_DisplayRep;
IMPORT Wr, M3AST, ASTWalk;
IMPORT AST_DisplayRep, M3ASTDisplay_handle;
REVEAL
AST_DisplayRep.Handle = M3ASTDisplay_handle.T BRANDED OBJECT
ignoreChildren: BOOLEAN := FALSE;
callOnEntry: BOOLEAN := FALSE;
callOnExit: BOOLEAN := FALSE;
closure: Closure := NIL;
OVERRIDES
Visit := DoVisit;
END;
REVEAL
Closure = ASTWalk.Closure BRANDED OBJECT
handle: Handle := NIL;
END;
PROCEDURE Nodes(
n: M3AST.NODE;
s: Wr.T)
RAISES {Wr.Failure}=
VAR
handle := NEW(Handle);
BEGIN
DoNodes(handle, n, s);
END Nodes;
PROCEDURE ModeNodes(
n: M3AST.NODE;
c: Closure;
vm : ASTWalk.VisitModeControl;
s: Wr.T)
RAISES {Wr.Failure} =
VAR
handle := NEW(Handle, closure := c);
BEGIN
c.handle := handle;
handle.callOnEntry := ASTWalk.VisitMode.Entry IN vm;
handle.callOnExit := ASTWalk.VisitMode.Exit IN vm;
DoNodes(handle, n, s);
END ModeNodes;
PROCEDURE DoNodes(
handle: Handle;
n: M3AST.NODE;
s: Wr.T)
RAISES {Wr.Failure}=
<*FATAL ANY*>
BEGIN
handle.stream := s;
TRY
DoVisit(handle, n);
EXCEPT
ASTWalk.Aborted =>
END;
END DoNodes;
PROCEDURE DoVisit(handle: Handle; n: M3AST.NODE) RAISES ANY=
BEGIN
IF handle.callOnEntry THEN handle.closure.callback(n); END;
IF NOT handle.ignoreChildren THEN
n.display(handle)
END;
IF handle.callOnExit THEN handle.closure.callback(n); END;
handle.ignoreChildren := FALSE;
END DoVisit;
PUBLIC
PROCEDURE IgnoreChildren(c: Closure) RAISES {} =
BEGIN
c.handle.ignoreChildren := TRUE;
END IgnoreChildren;
BEGIN
END M3ASTDisplay.